/* ============================================
   防拐卫士 — 共享样式表
   暗色主题 · 渐变背景 · 高对比警示色
   ============================================ */

/* --- CSS 自定义属性（主题色） --- */
:root {
  --color-primary: #ef4444;       /* 警示红 */
  --color-primary-hover: #dc2626;
  --color-accent: #f97316;        /* 橙 */
  --color-warning: #eab308;       /* 黄 */
  --color-bg: #0a0a0f;            /* 深黑底 */
  --color-bg-card: #1a1a2e;       /* 卡片底 */
  --color-bg-card-hover: #222240;
  --color-text: #e0e0e0;
  --color-text-dim: #9090a0;
  --color-border: #2a2a4a;
  --color-success: #22c55e;       /* 绿 */
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  --transition: 0.25s ease;
}

/* --- 全局重置 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  background: linear-gradient(135deg, #0a0a0f 0%, #1a0a0a 40%, #0f0a1a 100%);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* --- 渐变标题 --- */
.gradient-title {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent), var(--color-warning));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  letter-spacing: 1px;
}

/* --- 导航栏 --- */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-bar .logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-bar .logo:hover {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: 12px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
  background: rgba(239, 68, 68, 0.15);
}

/* --- 卡片 --- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

.card:hover {
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.card h2, .card h3 {
  margin-bottom: 10px;
}

.card p {
  color: var(--color-text-dim);
  font-size: 0.95rem;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: 10px;
  font-family: var(--font-stack);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  color: #fff;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent), #ea580c);
}

.btn-accent:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(249, 115, 22, 0.4);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.05);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* --- 容器布局 --- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

/* --- 页面头部 --- */
.page-header {
  text-align: center;
  padding: 40px 20px 20px;
}

.page-header h1 {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.page-header p {
  color: var(--color-text-dim);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* --- 返回首页链接 --- */
.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 16px;
  transition: var(--transition);
}

.back-home:hover {
  color: var(--color-primary);
}

/* --- 页脚 --- */
.footer {
  text-align: center;
  padding: 32px 20px;
  color: var(--color-text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
  margin-top: 60px;
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  .nav-bar {
    flex-direction: column;
    gap: 12px;
    padding: 12px 16px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .page-header h1 {
    font-size: 1.6rem;
  }

  .container {
    padding: 20px 16px;
  }

  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* --- 工具类 --- */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.gap-12 { gap: 12px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-col { flex-direction: column; }

/* --- 心跳脉冲动画 --- */
@keyframes pulse-heart {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.pulse {
  animation: pulse-heart 0.8s ease-in-out infinite;
}

/* --- 渐入动画 --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeInUp 0.6s ease forwards;
}

/* --- 警示闪烁 --- */
@keyframes blink-warning {
  0%, 100% { border-color: var(--color-primary); }
  50% { border-color: var(--color-warning); }
}

.blink-border {
  animation: blink-warning 1.2s ease-in-out infinite;
}

/* --- Toast 提示 --- */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 14px 24px;
  border-radius: 10px;
  color: #fff;
  font-weight: 600;
  z-index: 999;
  transform: translateX(120%);
  transition: transform 0.4s ease;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.toast.show {
  transform: translateX(0);
}

.toast-success { background: var(--color-success); }
.toast-error { background: var(--color-primary); }
.toast-info { background: var(--color-accent); }

/* --- 模态框 --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 480px;
  width: 90%;
  box-shadow: var(--shadow);
}